Linear scaling between momentum and spin scattering in graphene

Spin transport in graphene carries the potential of a long spin diffusion length at room temperature. However, extrinsic relaxation processes limit the current experimental values to 1-2 um. We present Hanle spin precession measurements in gated lateral spin valve devices in the low to high (up to 1...

Full description

Saved in:
Bibliographic Details
Published inarXiv.org
Main Authors Jozsa, C, Maassen, T, Popinciuc, M, Zomer, P J, Veligura, A, Jonkman, H T, van Wees, B J
Format Paper Journal Article
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 28.11.2009
Subjects
Carrier density
Diffusion
Diffusion coefficient
Diffusion length
Graphene
Physics - Materials Science
Physics - Mesoscale and Nanoscale Physics
Scaling
Scattering
Spin valves
Online AccessGet full text

Cover

More Information
Summary:Spin transport in graphene carries the potential of a long spin diffusion length at room temperature. However, extrinsic relaxation processes limit the current experimental values to 1-2 um. We present Hanle spin precession measurements in gated lateral spin valve devices in the low to high (up to 10^13 cm^-2) carrier density range of graphene. A linear scaling between the spin diffusion length and the diffusion coefficient is observed. We measure nearly identical spin- and charge diffusion coefficients indicating that electron-electron interactions are relatively weak and transport is limited by impurity potential scattering. When extrapolated to the maximum carrier mobilities of 2x10^5 cm^2/Vs, our results predict that a considerable increase in the spin diffusion length should be possible.
ISSN:2331-8422
DOI:10.48550/arxiv.0910.1054